AT&T introduced a service Wednesday that uses geo-location technology to send text messages to shoppers informing them of nearby stores offering sales and other promotions. The free opt-in AT&T Alerts service is compatible with all of the carrier's smartphones except the iPhone 5, which the company said it will add down the road. Also at AT&T, Mobility head Ralph de la Vega offered an update on the carrier's mobile-wallet tests in Austin, Texas, and Salt Lake City, saying that the major challenge is ensuring that the near-field communication technology in smartphones is secure.

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